isolation and high genetic drift. However, with whom the Australian population shows a greater genetic affinity is with the Spanish population, a fact that evidences its ancestral European origin. In the field of Spanish breeds, the study “corroborates previous results and conclusions, such as the marked common ancestry of the Andalusian and Majorera de Canarias races, perfectly differentiated in all the analyzes (autosomal polymorphisms, mitochondrial DNA and Y Chromosome, of the other breeds with black fur from the Spanish state (Catalan, Balearic, Zamorano-Leonesa and Encartaciones from the Basque Country) ”, points out Jordi Jordana . Genetic implications of selection The study reveals that, contrary to what had been described, in the

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evolutionary history of the donkey there was a significant reproductive bias, as a result of the selective process that took place during or after domestication. “The variability of the donkey Y Albania WhatsApp Number List chromosome is quite low, much lower than the mitochondrial variability. This suggests that, historically, as had already been shown in the horse, a low number of stallions were used very intensively as breeders, mating with numerous females ”, explains Marcel Amills . On the other hand, the researchers have also studied the imprint of selection on two clearly differentiated pigmentation patterns in donkeys: the Dun pattern, more ancestral, characterized by a strong dilution of pigmentation – individuals are gray, coppery, wolfish or Buzzards-, and the so-called non-

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Dun, in which this dilution of the coloration does not exist and, therefore, the individuals, essentially domestic donkeys, maintain a more intense pigmentation and the basic black and brown coats. Research has found that a mutation in the TBX3 gene is responsible for the non-Dun coloration in the donkey. In the horse, two different mutations from that observed in donkeys, but located in the same gene, are responsible for the non-Dun coloration. Likewise, this work has shown that the biochemical basis of pigmentation dilution is very similar in horses and donkeys, since in both species the TBX3 gene affects the symmetry of the distribution of pigment granules in the hair. “This result shows that the selection process for undiluted colorations that took place

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